#pragma once
#include <fstream>
#include <sys/stat.h>
#include <string>
#include <unordered_map>
#include <vector>
#include "LogMessage.hpp"

std::unordered_map<int, std::string> _statu_msg = {
    {100, "Continue"},
    {101, "Switching Protocol"},
    {102, "Processing"},
    {103, "Early Hints"},
    {200, "OK"},
    {201, "Created"},
    {202, "Accepted"},
    {203, "Non-Authoritative Information"},
    {204, "No Content"},
    {205, "Reset Content"},
    {206, "Partial Content"},
    {207, "Multi-Status"},
    {208, "Already Reported"},
    {226, "IM Used"},
    {300, "Multiple Choice"},
    {301, "Moved Permanently"},
    {302, "Found"},
    {303, "See Other"},
    {304, "Not Modified"},
    {305, "Use Proxy"},
    {306, "unused"},
    {307, "Temporary Redirect"},
    {308, "Permanent Redirect"},
    {400, "Bad Request"},
    {401, "Unauthorized"},
    {402, "Payment Required"},
    {403, "Forbidden"},
    {404, "Not Found"},
    {405, "Method Not Allowed"},
    {406, "Not Acceptable"},
    {407, "Proxy Authentication Required"},
    {408, "Request Timeout"},
    {409, "Conflict"},
    {410, "Gone"},
    {411, "Length Required"},
    {412, "Precondition Failed"},
    {413, "Payload Too Large"},
    {414, "URI Too Long"},
    {415, "Unsupported Media Type"},
    {416, "Range Not Satisfiable"},
    {417, "Expectation Failed"},
    {418, "I'm a teapot"},
    {421, "Misdirected Request"},
    {422, "Unprocessable Entity"},
    {423, "Locked"},
    {424, "Failed Dependency"},
    {425, "Too Early"},
    {426, "Upgrade Required"},
    {428, "Precondition Required"},
    {429, "Too Many Requests"},
    {431, "Request Header Fields Too Large"},
    {451, "Unavailable For Legal Reasons"},
    {501, "Not Implemented"},
    {502, "Bad Gateway"},
    {503, "Service Unavailable"},
    {504, "Gateway Timeout"},
    {505, "HTTP Version Not Supported"},
    {506, "Variant Also Negotiates"},
    {507, "Insufficient Storage"},
    {508, "Loop Detected"},
    {510, "Not Extended"},
    {511, "Network Authentication Required"}};

std::unordered_map<std::string, std::string> _mime_msg = {
    {".aac", "audio/aac"},
    {".abw", "application/x-abiword"},
    {".arc", "application/x-freearc"},
    {".avi", "video/x-msvideo"},
    {".azw", "application/vnd.amazon.ebook"},
    {".bin", "application/octet-stream"},
    {".bmp", "image/bmp"},
    {".bz", "application/x-bzip"},
    {".bz2", "application/x-bzip2"},
    {".csh", "application/x-csh"},
    {".css", "text/css"},
    {".csv", "text/csv"},
    {".doc", "application/msword"},
    {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
    {".eot", "application/vnd.ms-fontobject"},
    {".epub", "application/epub+zip"},
    {".gif", "image/gif"},
    {".htm", "text/html"},
    {".html", "text/html"},
    {".ico", "image/vnd.microsoft.icon"},
    {".ics", "text/calendar"},
    {".jar", "application/java-archive"},
    {".jpeg", "image/jpeg"},
    {".jpg", "image/jpeg"},
    {".js", "text/javascript"},
    {".json", "application/json"},
    {".jsonld", "application/ld+json"},
    {".mid", "audio/midi"},
    {".midi", "audio/x-midi"},
    {".mjs", "text/javascript"},
    {".mp3", "audio/mpeg"},
    {".mpeg", "video/mpeg"},
    {".mpkg", "application/vnd.apple.installer+xml"},
    {".odp", "application/vnd.oasis.opendocument.presentation"},
    {".ods", "application/vnd.oasis.opendocument.spreadsheet"},
    {".odt", "application/vnd.oasis.opendocument.text"},
    {".oga", "audio/ogg"},
    {".ogv", "video/ogg"},
    {".ogx", "application/ogg"},
    {".otf", "font/otf"},
    {".png", "image/png"},
    {".pdf", "application/pdf"},
    {".ppt", "application/vnd.ms-powerpoint"},
    {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
    {".rar", "application/x-rar-compressed"},
    {".rtf", "application/rtf"},
    {".sh", "application/x-sh"},
    {".svg", "image/svg+xml"},
    {".swf", "application/x-shockwave-flash"},
    {".tar", "application/x-tar"},
    {".tif", "image/tiff"},
    {".tiff", "image/tiff"},
    {".ttf", "font/ttf"},
    {".txt", "text/plain"},
    {".vsd", "application/vnd.visio"},
    {".wav", "audio/wav"},
    {".weba", "audio/webm"},
    {".webm", "video/webm"},
    {".webp", "image/webp"},
    {".woff", "font/woff"},
    {".woff2", "font/woff2"},
    {".xhtml", "application/xhtml+xml"},
    {".xls", "application/vnd.ms-excel"},
    {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
    {".xml", "application/xml"},
    {".xul", "application/vnd.mozilla.xul+xml"},
    {".zip", "application/zip"},
    {".3gp", "video/3gpp"},
    {".3g2", "video/3gpp2"},
    {".7z", "application/x-7z-compressed"}};

class Util
{
private:
public:
        // 字符串分割函数
        static size_t Split(const std::string &src, const std::string &sep, std::vector<std::string> *arry)
        {
                size_t offset = 0;
                while (offset < src.size())
                {
                        size_t pos = src.find(sep, offset);
                        if (pos == std::string::npos)
                        {
                                if (offset >= src.size())
                                        break;
                                arry->push_back(src.substr(offset));
                                return arry->size();
                        }
                        if (pos == offset)
                        {
                                offset = pos + sep.size();
                                continue;
                        }

                        arry->push_back(src.substr(offset, pos - offset));
                        offset = pos + sep.size();
                }

                return arry->size();
        }
        // 读取文件中所有的内容
        static bool ReadFile(const std::string &file_name, std::string *buf)
        {
                std::ifstream ifs(file_name, std::ios::binary);
            if (ifs.is_open() == false) {
                printf("OPEN %s FILE FAILED!!", file_name.c_str());
                return false;
            }
            size_t fsize = 0;
            ifs.seekg(0, ifs.end);//跳转读写位置到末尾
            fsize = ifs.tellg();  //获取当前读写位置相对于起始位置的偏移量，从末尾偏移刚好就是文件大小
            ifs.seekg(0, ifs.beg);//跳转到起始位置
            buf->resize(fsize); //开辟文件大小的空间
            ifs.read(&(*buf)[0], fsize);
            if (ifs.good() == false) {
                printf("READ %s FILE FAILED!!", file_name.c_str());
                ifs.close();
                return false;
            }
            ifs.close();
            return true;
        }

        // 向文件中写入内容
        static bool WriteFile(const std::string &file_name, const std::string &Content)
        {
                std::ofstream of(file_name, std::ios::binary);
                if (of.is_open() == false)
                {
                        log_message(ERROR, "open file %s fail", file_name.c_str());
                        return false;
                }
                of.write(Content.c_str(), Content.size());
                if (of.good() == false)
                {
                        log_message(ERROR, "write file %s fail", file_name.c_str());
                        of.close();
                        return false;
                }
                of.close();
                return true;
        }

        // // URL编码 避免url请求路径与查询字符串或HTTP请求中的特殊字符产生歧义
        // 编码格式：将特殊的ASSCII码符号转换成16bit数据，并加上前缀%，C++ - C%2B%2B
        // 不编码特殊字符：.-_~字母和数字
        // RFC3986文档规定，编码格式 %HH
        // W3C标准中规定，查询字符串中的空格，需要编码为+， 解码则是+转空格
        static std::string UrlEncode(std::string &url, bool Is_Convert_Sapce_to_Plus)
        {
                std::string tmp;
                for (auto &tmp_char : url)
                {
                        if (tmp_char == '.' || tmp_char == '-' || tmp_char == '_' || tmp_char == '~' || isalnum(tmp_char))
                                tmp += tmp_char;
                        if (tmp_char == ' ' && Is_Convert_Sapce_to_Plus)
                                tmp += '+';
                        // 剩余字符需要进行编码为%HH 格式
                        char encode[4] = {0};
                        snprintf(encode, 4, "%%%2X", tmp_char);
                        tmp += encode;
                }
                return tmp;
        }

        // URL解码
        static std::string UrlDecode(const std::string url, bool Is_Convert_Sapce_to_Plus)
        {
                // 遇到了%，则将紧随其后的2个字符，转换为数字，第一个数字左移4位，然后加上第二个数字  + -> 2b  %2b->2 << 4 + 11
                std::string res;
                for (int i = 0; i < url.size(); i++)
                {
                        if (url[i] == '+' && Is_Convert_Sapce_to_Plus == true)
                        {
                                res += ' ';
                                continue;
                        }
                        if (url[i] == '%' && (i + 2) < url.size())
                        {
                                char v1 = HEXTOI(url[i + 1]);
                                char v2 = HEXTOI(url[i + 2]);
                                char v = v1 * 16 + v2;
                                res += v;
                                i += 2;
                                continue;
                        }
                        res += url[i];
                }
                return res;
        }

        // // 响应状态码的描述信息获取
        static std::string StatueDesc(int statu)
        {
                auto it = _statu_msg.find(statu);
                if (it != _statu_msg.end())
                {
                        return it->second;
                }
                return "UnKnow";
        }

        // // 根据文件后缀名获取文件mime
        static std::string ExtMime(const std::string &file_name)
        {
                // 先获取文件扩展名
                size_t pos = file_name.find_last_of('.');
                if (pos == std::string::npos)
                {
                        return "application/octet-stream";
                }
                // 根据扩展名，获取mime
                std::string ext = file_name.substr(pos);
                auto it = _mime_msg.find(ext);
                if (it == _mime_msg.end())
                {
                        return "application/octet-stream";
                }
                return it->second;
        }

        // // 判断一个文件是否是一个目录
        static bool IsDirectory(const std::string &file_name)
        {
                struct stat st;
                int ret = stat(file_name.c_str(), &st);
                if (ret < 0)
                {
                        return false;
                }
                return S_ISDIR(st.st_mode);
        }

        // // 判断这是否是一个普通文件
        static bool IsRegular(const std::string &file_name)
        {
                struct stat st;
                int ret = stat(file_name.c_str(), &st);
                if (ret < 0)
                {
                        return false;
                }
                return S_ISREG(st.st_mode);
        }
        // hppt请求路径有效性的判断
        // /index.html  --- 前边的/叫做相对根目录  映射的是某个服务器上的子目录
        // 想表达的意思就是，客户端只能请求相对根目录中的资源，其他地方的资源都不予理会
        // /../login, 这个路径中的..会让路径的查找跑到相对根目录之外，这是不合理的，不安全的
        static bool ValidPath(const std::string &path)
        {
                // 思想：按照/进行路径分割，根据有多少子目录，计算目录深度，有多少层，深度不能小于0
                std::vector<std::string> subdir;
                Split(path, "/", &subdir);
                int level = 0;
                for (auto &dir : subdir)
                {
                        if (dir == "..")
                        {
                                level--; // 任意一层走出相对根目录，就认为有问题
                                if (level < 0){
                                        log_message(ERROR, "请求路径不合法");
                                        return false;
                                }
                                       
                                continue;
                        }
                        level++;
                }
                return true;
        }

private:
        static char HEXTOI(char c)
        {
                if (c >= '0' && c <= '9')
                {
                        return c - '0';
                }
                else if (c >= 'a' && c <= 'z')
                {
                        return c - 'a' + 10;
                }
                else if (c >= 'A' && c <= 'Z')
                {
                        return c - 'A' + 10;
                }
                return -1;
        }
};
